218390086 has 8 divisors (see below), whose sum is σ = 327668544. Its totient is φ = 109167240.

The previous prime is 218390057. The next prime is 218390099. The reversal of 218390086 is 680093812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (40958568).

Almost surely, 2^218390086 is an apocalyptic number.

218390086 is a deficient number, since it is larger than the sum of its proper divisors (109278458).

218390086 is a wasteful number, since it uses less digits than its factorization.

218390086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27806.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 218390086 is about 14778.0271349054. The cubic root of 218390086 is about 602.2049298078.

The spelling of 218390086 in words is "two hundred eighteen million, three hundred ninety thousand, eighty-six".